The Arc Sparc-M V2 is the first of the Arc Division line of compact compensators with an added guide rod cover and features that wrap the front contour of the Gen5 factory Glock Slides. The Sparc will help you shoot flatter and faster in all situations. We offer our comp threaded in the standard 1/228 threaded barrels. Specifications for Arc Division Sparc M V2 Pistol Compensator: Manufacturer: Arc Division Color: Black Fabric/Material: 7075 Aluminum Threads per Inch: 1/2x28 Gun Make: Glock Gun Model: Glock 17, Glock 19 Length: 1 in Weight: 0.8 oz Condition: New Projectile Caliber: .355 Caliber Fit: Glock Features of Arc Division Sparc M V2 Pistol Compensator Single top port compensator Square back Package Contents: Arc Division Sparc M V2 Pistol Compensator Threadlocker Allen Key Set Screws Instruction Sticker What firearm models does the manufacturer say Arc Division Sparc M V2 Pistol Compensator is compatible with? The manufacturer says that Arc Division Sparc M V2 Pistol Compensator is compatible with Glock 19, Glock 17